Design eventually became standard issue CFP-90 although this earlier one had a better build quality (source: http://oefoif.forumotion.net/t8059-lowe-vector-i-woodland-camo-rucksack).
Velcro-closed pouches on sides have expansion bellows.
Lid is detachable from body like later Mystery Ranch BDSB rucksack.
Name stamped on several locations of exterior.
Detachable waist belt with integrated rappelling system:
Back pad is removable and attached to frame with velcro.
Buckle could be from 1984 – 1985 (source: http://survival-knife-184.com/sheath/sheath.html). No date codes on any plastic buckles:
Usage Photos and Further Information:
Likely from mid-1980’s commercial item (catalog here: http://soldiersystems.net/2017/02/21/lowe-vector-catalog/). Lowe rucksacks were tested by the Ranger Regiment around 1984 (source: https://www.facebook.com/groups/164093236986819/posts/4751017214961042/?comment_id=4751163974946366)
Fabric is like a green dominant ERDL (smaller print than real M81 woodland) and is similar to ALICE pack (400 or 420 denier packcloth) material, like SADF Niemoller Vest.
Russian Language forum thread about this model of rucksack: http://www.gearguide.ru/phpbb/viewtopic.php?f=18&t=383